Now if you use the same code in VS 2010, framework 4.0, and the 4.0 solid edge DLL, it works fine (and if I use the old application I'm trying to update, with the V19 DLL's, on a machine with V19, it also works fine).

From what I have found so far it seems to be an issue of framework, but I haven't managed to get further than that.

Now, assuming you have a document opened, in my case a part, you should get the following error with VS 2008 : " Could not load file or assembly 'CustomMarshalers, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. ".

Obviously, I don't have this error with the framework 4.0 DLL in VS 2010.

Re: Method not found

I have created a new work item for you for this issue. Work items are how users of open source projects can communicate issues like this. This enables the team to track issues and for everyone to track the progress. Any further comments that I make on this issue will be in the work item. Thanks so much.